TITLE:
phphg Guestbook Multiple Vulnerabilities

SECUNIA ADVISORY ID:
SA18758

VERIFY ADVISORY:
http://secunia.com/advisories/18758/

CRITICAL:
Moderately critical

IMPACT:
Security Bypass, Cross Site Scripting, Manipulation of data

WHERE:
>From remote

SOFTWARE:
phphg Guestbook 1.x
http://secunia.com/product/7821/

DESCRIPTION:
Aliaksandr Hartsuyeu has discovered some vulnerabilities in phphg
Guestbook, which can be exploited by malicious people to conduct
script insertion and SQL injection attacks, and bypass certain
security restrictions.

1) Input passed to the "username" parameter in "check.php" during
login and the "id" parameter in the administration section isn't
properly sanitised before being used in a SQL query. This can be
exploited to manipulate SQL queries by injecting arbitrary SQL code.

Successful exploitation requires that "magic_quotes_gpc" is
disabled.

2) Input passed to various fields when signing the guestbook isn't
properly sanitised before being used. This can be exploited to inject
arbitrary HTML and script code, which will be executed in a user's
browser session in context of an affected site when the malicious
guestbook entry is viewed.

3) An error caused due to an insecure authentication process can be
exploited to access the administration section by defining the
"loged", "username", and "user_level" cookie parameters.

The vulnerabilities have been confirmed in version 1.2. Other
versions may also be affected.

SOLUTION:
Edit the source code to ensure that input is properly sanitised and
that administrators are properly authenticated.

PROVIDED AND/OR DISCOVERED BY:
Aliaksandr Hartsuyeu

ORIGINAL ADVISORY:
http://evuln.com/vulns/58/summary.html

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